No, the Manukau harbour, an inlet of the Tasman Sea, is on the opposite coast to the North Shore on the Hauraki Gulf part of the Pacific Ocean. You cross the Waitemata Harbour to get from central Auckland to the North Shore.
Historians believe the term "golden" refers to the riches brought in via the harbor, or possibly to the rich yellow light that blazes across the water at sunset. The term "horn" refers to the shape of the inlet.
Inlet Valve is comprised of 2 words i.e. Inlet & Valve. Therefore Inlet Valve is that valve through which fuel or a mixture whose pressure in increased by reducing its volume in intaked into the cylinder.